AdvancedA-004-004-002
In any regulated power supply, the output is cleanest and the regulation is best:
B
Answer
Measurements and troubleshooting
Type
A
at the output of the pass transistor
B
at the point where the sampling network or error amplifier is connected
C
across the load
D
across the secondary of the pass transistor
Answer Notes
In a feedback-regulated power supply, the control circuit continuously monitors the output voltage to keep it stable. It does this by using a sampling network (or error amplifier) connected to a specific node in the circuit. The feedback loop corrects any voltage variations exactly at this monitoring point.
Therefore, the regulation is best and the output is cleanest right at the point where the sampling network connects, as the circuit compensates for any voltage drops up to that exact location.
Options like 'across the load' or 'at the output of the pass transistor' might experience voltage drops due to wire resistance or connections before or after the feedback node, meaning the regulation is slightly degraded at those locations.
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In a series-regulated power supply, the power dissipation of the pass transistor is:
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When discussing a power supply the_______ resistance is equal to the output voltage divided by the total current drawn, including the current drawn by the bleeder resistor: